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    <title>Document</title>
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    <script>
      // 借用父构造函数继承属性
      // 1. 父构造函数
      // function Father(uname, age) {
      //     // this 指向父构造函数的对象实例
      //     this.uname = uname;
      //     this.age = age;
      // }
      // // 2 .子构造函数
      // function Son(uname, age, score) {
      //     // this 指向子构造函数的对象实例
      //     Father.call(this, uname, age);
      //     this.score = score;
      // }
      // var son = new Son('刘德华', 18, 100);
      // console.log(son);

      function Father(x, y) {
        this.x = x;
        this.y = y;
      }
      function Son(x, y, z) {
        Father.call(this, x, y);
        this.z = z;
      }
      var son = new Son('陈伟霆','十八岁','帅一批')
      console.log(son);
    </script>
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